sound deadening

jschrauwen · Post by **jschrauwen** » November 14th, 2004, 3:31 pm

Looking for ways to make the interior quieter. Like to cut down the road, wind, engine and exhaust sound level. "92 GS.....Suggestions?

MikeUK · Post by **MikeUK** » January 9th, 2005, 1:02 pm

I put a phat exhaust on my 95 and the sound instde was too much. Have been told you can place a sheet of metal between the Zhaust and the car to stop some of the sound. Not tryed it my self.

Other noise

My dads Alfa 156 has an awsome clunk to it when you shut the doors and I thought the MX had bit of a tinny sound to it. So I took the alfa apart, to find they use polystireen in the door to quieten it a little.

Show_MX · Post by **Show_MX** » January 10th, 2005, 5:27 am

One way is to use Dynamat. It is designed to keep sound in (stereo) and road noise out. If the problem is noise from beneath your car, you can use Dynamat and also try some regular home carpet padding beneath your mx carpet.

Typhoonk · Post by **Typhoonk** » January 10th, 2005, 9:07 pm

heard there was this stuff called peel and stick that was pretty good. Some sort of insulation stuff you can get a Home Depot for pretty cheap. But I haven't checked it out yet. Suppose to be in 25 foot x 6inch rolls

ScooterBovine · Post by **ScooterBovine** » February 28th, 2005, 12:27 am

Just out of curiosity, how much Dynamat would it take to cover the entire MX-3? 100 square feet? Or more? I plan on doing this sometime when it gets warm out, so it'd be nice to know how much I am going to need for the job.

Show_MX · Post by **Show_MX** » February 28th, 2005, 3:23 am

5 bulk packs of dynamat will cover the entire interior. TRUST ME

ScooterBovine · Post by **ScooterBovine** » February 28th, 2005, 3:30 am

Including the roof? Or do you not dynamat the roof? And, when you say bulk packs, is that like 100 square feet a pack? I was looking on eBay and the packs there seem reasonable for the prices...

Show_MX · Post by **Show_MX** » February 28th, 2005, 3:32 am

i'm not sure exactly how many sq ft it is but yes, that includes the roof. look at my cardomain site.

MarkMoore · Post by **MarkMoore** » February 28th, 2005, 7:04 am

nooooo don't use dynamat... that stuff is a waste of money... i bought this roofing underlayment (type in "roof underlayment" or "roofing underlayment" in the mx-3.com search function) stuff which is for all intensive purposes the same stuff (it looks, feels, smells, and performs the same) except it's about 1/5 the cost of dynamat... i bought 200 sq. ft. (that's plenty) for $90 w/ tax...
unless you plan to compete in "sound-off" competitions with your system, than it's really impractical to use any more than 200 sq. ft., because it's been estimated that for every 50 lbs. you add to your car, you lose 1 horsepower. the stuff i used is called "Grace Ice & Water Shield"... you can "locate a distributor" by using this website... http://www.na.graceconstruction.com/pro ... &WT.srch=1

look to the left, and click the little green "locate a distributor" link, and go through the whole process of registering, and then you can find out who carries this "grace ice and water shield" near you... just my suggestion

ScooterBovine · Post by **ScooterBovine** » February 28th, 2005, 10:27 am

Sweet, thanks for the suggestion.

Acamori · Post by **Acamori** » February 28th, 2005, 12:15 pm

dynamat is better for vibration noise, or b-quiet ultimate (same stuff almost half the price). it took me 25 sq ft to cover the doors the rear quarters an the wheel wells, another 30-40 would probably have covered the whole floor and under the back seat/hatch area. not sure how much it'd take to cover the roof too. do whatever you want though.

MarkMoore · Post by **MarkMoore** » February 28th, 2005, 4:55 pm

also, you're gonna wanna become a trash picker... keep your eye out for people throwing out the padding which goes under carpeting... if you're intentionally looking for it, you'll spot it pretty frequently, because people often change up their carpeting... either that, or you can trash pick from the dumpster behind any carpet outlet/store... or, if you don't wanna be a cheapo like me, you can just buy the stuff new from the carpet store, as the stuff is probably on $.20-$.30 a sq. ft. But, why pay money when you can get some for free from a dumpster? you're gonna wanna go out and buy some spray adhesive (maybe the 3M stuff, like you might find in a craft store) and then start sticking the carpet padding to the interior door panels (on the inside of the interior panels, obviously, as you don't want to be able to see any of this from inside the cabin...) this stuff acts as an "open cell foam" and absorbs a lot of the sound waves that make it through your 1-2 layers of roofing underlayment (or dynamat, brown bread, b-quiet, raammat, edead http://www.edesignaudio.com/category.ph ... mp&cur=USD, etc.)

93SOHC · Post by **93SOHC** » March 1st, 2005, 2:18 am

MarkMoore wrote:also, you're gonna wanna become a trash picker... keep your eye out for people throwing out the padding which goes under carpeting... if you're intentionally looking for it, you'll spot it pretty frequently, because people often change up their carpeting... either that, or you can trash pick from the dumpster behind any carpet outlet/store... or, if you don't wanna be a cheapo like me, you can just buy the stuff new from the carpet store, as the stuff is probably on $.20-$.30 a sq. ft. But, why pay money when you can get some for free from a dumpster? you're gonna wanna go out and buy some spray adhesive (maybe the 3M stuff, like you might find in a craft store) and then start sticking the carpet padding to the interior door panels (on the inside of the interior panels, obviously, as you don't want to be able to see any of this from inside the cabin...) this stuff acts as an "open cell foam" and absorbs a lot of the sound waves that make it through your 1-2 layers of roofing underlayment (or dynamat, brown bread, b-quiet, raammat, edead http://www.edesignaudio.com/category.ph ... mp&cur=USD, etc.)

Just make sure the padding from the garbage doesnt smell like cat pee first!

ScooterBovine · Post by **ScooterBovine** » March 1st, 2005, 6:54 am

So, after I have 5 layers of whatever... Are the panels still going to fit on top??

MarkMoore · Post by **MarkMoore** » March 1st, 2005, 11:55 am

i haven't done this project yet, but have collected a ton of info and all my materials for the project and am just waiting for warm weather to roll around so that i can completely gut my whole interior and soundproof my baby... oh yea, fyi, you'll also wanna wait for a warm day (actually, it's probably safer to set aside 2 or 3 warm days, just in case... so if you're not already a weather channel junky, start looking for a few warm, dry days in a row) too, because the roofing underlayment stuff (or any other of the vast array of options i mentioned) is a sticky asphaltic, tar material which comes in 3 foot rolls... the stuff itself is actually very thin... one layer of the underlayment probably equals one layer of cardboard, or come to think of it, maybe even 2 layers of the underlayment equals the thickness of a single layer of cardboard---so it's not very thick at all is what i'm getting at here... the sticky underlayment stuff will be applied to the bare metal... the carpet padding is usually applied to the interior panels w/ spray adhesive, although it can really go anywhere you want it to... here are some great links which helped me out a lot....

http://maxima.cardomain.com/memberpage/216257/3

http://www.mmxpress.com/technical/sound_proofing.htm

there are others too, just can't find 'em right now in my searches... in conclusion--1 or 2 layers of your choice of matting, 1 or 2 layers of carpet padding, and try some expanding foam for the hard to reach areas...